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NPort Express Series

1-port entry-level RS-232/422/485 serial device servers

Features and Benefits

  • 3-in-1 serial port: RS-232, RS-422, or RS-485
  • Variety of operation modes, including TCP Server, TCP Client, UDP, Ethernet Modem, and Pair Connection
  • Real COM/TTY drivers for Windows and Linux
  • 2-wire RS-485 with Automatic Data Direction Control (ADDC)
Certifications
Overview
Specifications
Resources
Models
Contact Sales

Introduction

The NPort® DE-211 and DE-311 are 1-port serial device servers that support RS-232, RS-422, and 2-wire RS-485. The DE-211 supports 10 Mbps Ethernet connections and has a DB25 female connector for the serial port. The DE-311 supports 10/100 Mbps Ethernet connections and has a DB9 female connector for the serial port. Both device servers are ideal for applications that involve information display boards, PLCs, flow meters, gas meters, CNC machines, and biometric identification card readers.

  • No. of Ports

    1

  • Magnetic Isolation Protection

    1.5 kV (built-in)

  • 10/100BaseT(X) Ports (RJ45 connector)

    DE-311: Auto MDI/MDI-X connection

  • 10BaseT(X) Ports, RJ45 Connector

    DE-211: Auto MDI/MDI-X connection

  • Configuration Options

    Windows Utility, Telnet Console, Serial Console

  • Management

    ARP, BOOTP, DHCP Client, IPv4, TCP/IP, Telnet, UDP, ICMP

  • Linux Real TTY Drivers

    Kernel versions: 2.4.x, 2.6.x, 3.x, 4.x, and 5.x

  • Fixed TTY Drivers

    SCO UNIX, SCO OpenServer, UnixWare 7, QNX 4.25, QNX 6, Solaris 10, FreeBSD, AIX 5.x, HP-UX 11i, Mac OS X

  • Android API

    Android 3.1.x and later

  • Windows Real COM Drivers

    Windows 95/98/ME/NT/2000, Windows XP/2003/Vista/2008/7/8/8.1/10/11 (x86/x64), Windows 2008 R2/2012/2012 R2/2016/2019 (x64), Windows Server 2022, Windows Embedded CE 5.0/6.0, Windows XP Embedded

  • Connector

    DE-211: DB25 female
    DE-311: DB9 female

  • Serial Standards

    RS-232, RS-422, RS-485

  • No. of Ports

    1

  • Baudrate

    Supports standard baudrates (unit=bps): 50, 75, 110, 134, 150, 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 19200, 38400, 57600, 115200, 230.4k

  • Data Bits

    5, 6, 7, 8

  • Stop Bits

    1, 1.5, 2

  • Parity

    None, Even, Odd, Space, Mark

  • Flow Control

    None, RTS/CTS, XON/XOFF

  • RS-485 Data Direction Control

    ADDC (automatic data direction control)

  • RS-232

    TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND

  • RS-422

    Tx+, Tx-, Rx+, Rx-, RTS+, RTS-, CTS+, CTS-, GND

  • RS-485-2w

    Data+, Data-, GND

  • Input Current

    DE-211: 180 mA @ 12 VDC, 100 mA @ 24 VDC
    DE-311: 300 mA @ 9 VDC, 150 mA @ 24 VDC

  • Input Voltage

    DE-211: 12 to 30 VDC
    DE-311: 9 to 30 VDC

  • Alert Tools

    Built-in buzzer and RTC (real-time clock)

  • Housing

    Metal

  • Dimensions (with ears)

    90.2 x 100.4 x 22 mm (3.55 x 3.95 x 0.87 in)

  • Dimensions (without ears)

    67 x 100.4 x 22 mm (2.64 x 3.95 x 0.87 in)

  • Weight

    480 g (1.06 lb)

  • Operating Temperature

    0 to 55°C (32 to 131°F)

  • Storage Temperature (package included)

    -40 to 75°C (-40 to 167°F)

  • Ambient Relative Humidity

    5 to 95% (non-condensing)

  • EMC

    EN 55032/35

  • EMI

    CISPR 32, FCC Part 15B Class B

  • EMS

    IEC 61000-4-2 ESD: Contact: 4 kV; Air: 8 kV
    IEC 61000-4-3 RS: 80 MHz to 1 GHz: 3 V/m
    IEC 61000-4-4 EFT: Power: 1 kV; Signal: 0.5 kV
    IEC 61000-4-5 Surge: Power: 1 kV
    IEC 61000-4-5 Surge: Power: 1 kV; Signal: 1 kV
    IEC 61000-4-6 CS: 150 kHz to 80 MHz: 10 V/m; Signal: 10 V/m
    IEC 61000-4-6 CS: 150 kHz to 80 MHz: 3 V/m; Signal: 3 V/m
    IEC 61000-4-11

  • Safety

    UL 60950-1

  • Medical

    DE-311: EN 55011: 2007+A2: 2007 Class A (Group 1) compliant
    DE-311: EN 60601-1-2: 2007 compliant

  • Green Product

    RoHS, CRoHS, WEEE

  • Time

    DE-211: 347,822 hrs
    DE-311: 225,529 hrs

  • Standards

    MIL-HDBK-217F

Software, Firmware, and Drivers

FILTER

All Driver Firmware Library Utility
Name Type Checksum Version Operating System Release Date
Real TTY Linux Kernel 6.x Driver Download
2.5 MB 		Driver
SHA-512
v6.2
  • Linux Kernel 6.x
 Jan 22, 2026 Jan 22, 2026 Release notes
Real TTY Linux Kernel 4.x Driver Download
650.0 KB 		Driver
SHA-512
v4.4
  • Linux Kernel 4.x
 Jan 22, 2026 Jan 22, 2026 Release notes
Real TTY Linux Kernel 5.x Driver Download
650.0 KB 		Driver
SHA-512
v5.6
  • Linux Kernel 5.x
 Jan 22, 2026 Jan 22, 2026 Release notes
Moxa Windows Driver Manager (Windows 11 and Server 2022 and later, WHQL certified) Download
11.9 MB 		Driver
SHA-512
v4.5
  • Windows 11
  • Windows Server 2022
  • Windows Server 2025
 Jan 09, 2026 Jan 09, 2026 Release notes
Moxa Windows Driver Manager (Windows 7 to 10 and Windows Server 2008 R2 to 2019, WHQL certified) Download
12.2 MB 		Driver
SHA-512
v3.8
  • Windows 10
  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows Server 2008 R2
  • Windows Server 2012
  • Windows Server 2012 R2
  • Windows Server 2016
  • Windows Server 2019
 Jan 09, 2026 Jan 09, 2026 Release notes
PComm Lite - Serial Communication Tool Download
5.3 MB 		Utility
SHA-512
v1.9
  • Windows
 Dec 12, 2025 Dec 12, 2025 Release notes
Device Search Utility (portable) Download
128.6 MB 		Utility
SHA-512
v3.1
  • Windows 10
  • Windows 11
  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows Server 2008 R2
  • Windows Server 2012
  • Windows Server 2012 R2
  • Windows Server 2016
  • Windows Server 2019
  • Windows Server 2022
  • Windows Server 2025
 Nov 17, 2025 Nov 17, 2025 Release notes
Device Search Utility (installer) Download
236.2 MB 		Utility
SHA-512
v3.1
  • Windows 10
  • Windows 11
  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows Server 2008 R2
  • Windows Server 2012
  • Windows Server 2012 R2
  • Windows Server 2016
  • Windows Server 2019
  • Windows Server 2022
  • Windows Server 2025
 Nov 17, 2025 Nov 17, 2025 Release notes
Moxa CLI Configuration Tool (Linux) Download
11.6 MB 		Utility
SHA-512
v1.5
  • Linux Kernel 2.6.x
  • Linux Kernel 3.x
  • Linux Kernel 4.x
  • Linux Kernel 5.x
  • Linux Kernel 6.x
 Aug 05, 2025 Aug 05, 2025 Release notes
Real TTY Linux Kernel 5.x Driver Download
122.5 KB 		Driver
SHA-512
v5.5
  • Linux Kernel 5.x
 Mar 12, 2025 Mar 12, 2025 Release notes
Real TTY Linux Kernel 6.x Driver Download
121.7 KB 		Driver
SHA-512
v6.1
  • Linux Kernel 6.x
 Sep 05, 2024 Sep 05, 2024 Release notes
Serial Device Server Driver for macOS (macOS 11.x to 14) Download
6.3 MB 		Driver
SHA-512
v1.3
  • macOS 11
  • macOS 12
  • macOS 13
  • macOS 14
 Sep 02, 2024 Sep 02, 2024 Release notes
Real TTY Linux Kernel 4.x Driver Download
123.3 KB 		Driver
SHA-512
v4.3
  • Linux Kernel 4.x
 Aug 07, 2024 Aug 07, 2024 Release notes
Real TTY drivers for Linux 3.x.x Download
94.6 KB 		Driver
SHA-512
v3.0
  • Linux Kernel 3.x
 Jul 04, 2024 Jul 04, 2024 Release notes
Serial Device Server Driver for macOS (macOS 10.1x to 14) Download
689.8 KB 		Driver
SHA-512
v1.2
  • macOS 10.12
  • macOS 10.13
  • macOS 10.14
  • macOS 10.15
  • macOS 11
  • macOS 12
  • macOS 13
  • macOS 14
 Nov 10, 2023 Nov 10, 2023 Release notes
Device Search Utility Download
2.2 MB 		Utility
SHA-512
v2.7
  • Windows 10
  • Windows 11
  • Windows 2000
  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows 95
  • Windows 98
  • Windows 98 SE
  • Windows NT
  • Windows Server 2003
  • Windows Server 2008
  • Windows Server 2008 R2
  • Windows Server 2012
  • Windows Server 2012 R2
  • Windows Server 2016
  • Windows Server 2019
  • Windows Server 2022
  • Windows Vista
  • Windows XP
 Jun 28, 2023 Jun 28, 2023 Release notes
Device Server Android API Download
18.0 MB 		Library
SHA-512
v1.1
  • Android
 Dec 22, 2022 Dec 22, 2022 Release notes
Serial Device Server Driver for macOS (macOS 10.12 to 10.15) Download
611.6 KB 		Driver
SHA-512
v1.1
  • macOS 10.12
  • macOS 10.13
  • macOS 10.14
  • macOS 10.15
 Sep 26, 2022 Sep 26, 2022 Release notes
Real TTY drivers for Linux 2.x.x Download
92.2 KB 		Driver
SHA-512
v2.0
  • Linux Kernel 2.4.x
  • Linux Kernel 2.6.x
 Oct 24, 2019 Oct 24, 2019 Release notes
Real TTY drivers for Linux 4.x.x Download
95.4 KB 		Driver
SHA-512
v4.0
  • Linux Kernel 4.x
 Oct 24, 2019 Oct 24, 2019 Release notes
Real TTY drivers for Linux 5.x.x Download
95.3 KB 		Driver
SHA-512
v5.0
  • Linux Kernel 5.x
 Oct 24, 2019 Oct 24, 2019 Release notes
Windows Driver Manager (Windows Vista, Server 2008, and prior) Download
2.6 MB 		Driver
SHA-512
v2.0
  • Windows 2000
  • Windows 95
  • Windows 98
  • Windows 98 SE
  • Windows ME
  • Windows NT
  • Windows Server 2003
  • Windows Server 2008
  • Windows Vista
  • Windows XP
 Aug 01, 2019 Aug 01, 2019 Release notes
Firmware for NPort Express Series (DE-211) Download
152.6 KB 		Firmware
SHA-512
v2.2
Jan 21, 2019 Jan 21, 2019 Release notes
Firmware for NPort Express Series (DE-311) Download
171.0 KB 		Firmware
SHA-512
v3.0
Jan 21, 2019 Jan 21, 2019 Release notes
NPort Administration Suite Download
4.0 MB 		Driver
SHA-512
v1.22
  • Windows 10
  • Windows 2000
  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows 95
  • Windows 98
  • Windows ME
  • Windows NT
  • Windows Server 2003
  • Windows Server 2008
  • Windows Server 2008 R2
  • Windows Server 2012
  • Windows Server 2012 R2
  • Windows Vista
  • Windows XP
 Oct 27, 2016 Oct 27, 2016 Release notes
Driver for NPort Express Series (WinCE 5) Download
230.5 KB 		Driver
SHA-512
v1.6
  • Windows CE 5.0
  • Windows CE 6.0
 Nov 14, 2012 Nov 14, 2012 Release notes
Driver for NPort Express Series (WinXP Embedded) Download
1.2 MB 		Driver
SHA-512
v1.14
  • Windows XP Embedded
 Apr 04, 2012 Apr 04, 2012 Release notes
Driver for NPort Express Series (UNIX) Download
73.0 KB 		Driver
SHA-512
v3.5
  • FreeBSD 5.x
  • FreeBSD 6.x
  • FreeBSD 7.x
  • FreeBSD 8.x
  • HP-UX
  • IBM AIX 5.3
  • Mac OS X
  • QNX 4.x
  • QNX 6.x
  • SCO OpenServer 5
  • SCO OpenServer 6
  • SCO UnixWare 7
  • Solaris 10
 Mar 19, 2012 Mar 19, 2012 Release notes

Support Documents

FILTER

All 2D CAD Datasheet Declaration Manual QIG Tech Note
Name Type Version Release Date
Moxa CLI Configuration Tool User Manual Download
850.9 KB 		Manual v2.5 Feb 12, 2026 Feb 12, 2026
Device Search Utility v3.x User Manual Download
2.8 MB 		Manual v1.1 Nov 17, 2025 Nov 17, 2025
FOSS Statement for Moxa PComm Lite Suite for Windows Download
108.5 KB 		Declaration v1.0 Feb 07, 2025 Feb 07, 2025
FOSS Statement for Moxa CLI Configuration Tool Download
114.6 KB 		Declaration v1.0 Dec 10, 2024 Dec 10, 2024
FOSS Statement for NPort macOS driver Download
108.4 KB 		Declaration v1.0 Oct 29, 2024 Oct 29, 2024
FOSS Statement for Device Search Utility Download
161.8 KB 		Declaration v1.0 Jun 24, 2024 Jun 24, 2024
Declaration of Conformity (EU/UK) for NPort Express Series (DE-311) Download
303.8 KB 		Declaration v1.0 Mar 04, 2024 Mar 04, 2024
Declaration of Conformity (EU/UK) for NPort Express Series (DE-211) Download
303.6 KB 		Declaration v1.0 Mar 04, 2024 Mar 04, 2024
Tech Note: Real COM mode for NPort Download
479.5 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: Moxa Real TTY Driver Porting Guide for Arm-based Platforms Download
372.3 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: TCP Server Mode for NPort Download
395.0 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: UDP Mode for NPort Download
397.2 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: TCP Client Mode for NPort Download
394.5 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: Real TTY Driver for NPort Download
379.2 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: Reverse Telnet Mode for NPort Download
364.5 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: Ethernet Modem Mode Download
429.4 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: Fixed TTY Driver for NPort Download
389.7 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: Pair Connection Mode Download
544.0 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
Tech Note: Accessing Multiple NPorts Behind NAT Download
497.2 KB 		Tech Note v2.0 Jun 08, 2023 Jun 08, 2023
FOSS Statement for Moxa Windows Driver Manager Download
255.8 KB 		Declaration v1.0 Aug 01, 2022 Aug 01, 2022
FOSS Statement for Moxa Linux Driver Download
1.7 MB 		Declaration v1.0 May 01, 2022 May 01, 2022
Datasheet for NPort Express Series Download
824.5 KB 		Datasheet v1.4 Apr 23, 2022 Apr 23, 2022
Tech Note: Moxa Real TTY Driver Porting Guide for Arm-based Platforms Download
372.3 KB 		Tech Note v1.0 Aug 05, 2021 Aug 05, 2021
QIG for NPort Express Series (DE-211) Download
758.2 KB 		QIG v8.2 May 06, 2021 May 06, 2021
QIG for NPort Express Series (DE-311) Download
741.8 KB 		QIG v5.2 May 06, 2021 May 06, 2021
Tech Note: Real COM mode for NPort Download
423.5 KB 		Tech Note v1.1 Apr 30, 2020 Apr 30, 2020
Manual for NPort Express Series (DE-311 HIG) Download
2.6 MB 		Manual v5.0 Oct 02, 2017 Oct 02, 2017
Tech Note: NPort Real COM Mode for DNP3 Applications Download
1.9 MB 		Tech Note v1.0 Nov 17, 2014 Nov 17, 2014
Tech Note: TCP Server Mode for NPort Download
311.3 KB 		Tech Note v1.0 Jun 29, 2013 Jun 29, 2013
Manual for NPort Express Series (DE-211 HIG) Download
2.3 MB 		Manual v8.0 Feb 20, 2013 Feb 20, 2013
Tech Note: Using DNP3 with the NPort Series Download
1.0 MB 		Tech Note v1.0 Mar 29, 2012 Mar 29, 2012
Tech Note: NPort's Pair Connection Mode Download
211.4 KB 		Tech Note v1.0 Nov 03, 2009 Nov 03, 2009
Tech Note: TCP Client Mode for NPort Download
224.4 KB 		Tech Note v1.0 Nov 03, 2009 Nov 03, 2009
Tech Note: NPort's Ethernet Modem Mode Download
116.6 KB 		Tech Note v1.0 Nov 03, 2009 Nov 03, 2009
Tech Note: UDP Mode for NPort Download
173.2 KB 		Tech Note v1.0 Nov 03, 2009 Nov 03, 2009
Tech Note: Reverse Telnet Mode for NPort Download
204.6 KB 		Tech Note v1.0 Nov 03, 2009 Nov 03, 2009
Tech Note: Accessing Multiple NPorts Behind NAT Download
482.6 KB 		Tech Note v1.0 Nov 03, 2009 Nov 03, 2009
Tech Note: Real COM Mode for NPort Download
253.0 KB 		Tech Note v1.0 Nov 03, 2009 Nov 03, 2009
Manual for NPort Express Series Download
474.3 KB 		Manual v3.0 Oct 14, 2009 Oct 14, 2009
2D CAD for NPort DE-211 TOP Download
26.0 KB 		2D CAD May 22, 2009 May 22, 2009
2D CAD for NPort DE-311 TOP Download
483.5 KB 		2D CAD May 22, 2009 May 22, 2009
Tech Note: Fixed TTY Driver for NPort Download
207.6 KB 		Tech Note v1.0 May 21, 2009 May 21, 2009
Tech Note: Real TTY Driver for NPort Download
204.2 KB 		Tech Note v1.0 May 21, 2009 May 21, 2009

Related Content

FILTER

All Technology Guide

Available Models (2)

Show Images
Compare
moxa-de-211-image.jpg | MoxaDE-211
Compare
moxa-de-311-image.jpg | MoxaDE-311
Ethernet Port Speed10 Mbps10/100 Mbps
Serial ConnectorDB25 femaleDB9 female
Power Input12 to 30 VDC9 to 30 VDC
Medical Certifications–EN 60601-1-2 Class B, EN 55011
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